Since then I try to make words from my number plates as a memory aid until I remember it. With VZN it's not so easy ... the VZ brought to mind "vizier" as in "grand vizier", as seen in some Terry Pratchett books. So I think of the car as Vizier ... Not :)

Sorry, had to. This is a game I have played in the car for ages. My wife is always trying to find the most ridiculous plates she can to try and stump me. I love the challenge of a personalized plate. They make the best ones.